Let-off mechanism for looms.



J. DUPUIS.

LET-OFF MECHANlSM FOR LOOMS.

APPt-ICATION FILED APR.24. 1915.

1,254,127. Patented Jan.22,1918.

WITNESSES: [NI/EN TOR Mm. L/asE/W 00/0/5, 4 yw M.

A TTORIVEY8 JOSEPH DUPUIS, OF FALL RIVER, MASSACHUSETTS.

LET-OFF MECHANISM FOR LOOMS.

Application filed April 24, 1915.

To all whom it may concern Be it known that 1, JOSEPH Dorms, a citizenof the United States, and a resident of Fall River, in the county ofBristol and State of Massachusetts, have invented a new and usefulImprovement in Let-Gff Mechanism for Looms of which the following is aspecification.

My invention is an improvement in machine brakes, and has for its objectto provide a device of the character specified, for automaticallyvarying the tension on the warp roller of a loom in accordance with thevarying conditions to which the roller is subjected as the warp is drawnoff to provide for a continuous uniform web, which will be smooth andfree from knots and roughness.

In the drawings Figure 1 is front view of an embodiment of theinvention;

Fig. 2 is a perspective view of one of the levers, and

Fig. 3 is a section on the line 3-3 of Fig. 2.

While the invention is shown in connection with the warp roller or reelof a loom, it will be obvious that it is equally well adapted for usewith any machine or mechanism, wherein a brake is desired that willoperate automatically in accordance with the conditions to which theroller or reel is subj ected.

In the embodiment of the invention shown in Figs. 1 to 3, the warproller 130 has its journal pins 131 journaled in bearings 13:2 on theframe 133, and the brake disks or wheels 134 at the ends of the rollerhave cotiperating therewith the brake chains 135. Each chain has one endconnected to the frame in any suitable manner, and the other end of eachchain is connected to a hook or eye on the upper end of a bolt 136.

The lower end of the bolt passes between the arms of a fork 137 on alever 138. The lever is provided with a bearing 139 between the fork andthe body of the lever, and this bearing of each lever is journaled on ajournal in 140 extending laterally from the frame of the loom andconnected thereto in any manner, as for instance by means of a slot toform an adjustable connection.

The lever 138 is grooved vertically adjacent to the bearing as indicatedat 141, and a slotted arm 142 is mounted to slide vertically in theslot. A bolt 143 is passed Specification of Letters Patent.

Patented J an. 22, 1918.

Serial No. 23,687.

through an opening in the lever 138, and through the slot of the slottedarm, and the bolt is engaged by a nut 144 to hold the parts in place.

A washer 145 is arranged on the bolt between the nut and the inner faceof the slotted arm, and the nut and bolt slidably connect the slottedarm to the lever. The lower end of arm 142 is provided with a fork 146,and the fork of each arm is engaged by an eye bolt 147, each eye boltbeing paslsed between the arms of the adjacent or r.

A three armed rock lever is journaled on the frame of the loom betweenthe lovers 138 on a journal pin 148, and the rock lever is provided withoppositely extending similar arms 149, and with a curved arm 150. Thearms 149 are longitudinally slotted as shown at 151, and a clip 15?. isadjustably connected with each slot by means of a bolt and nut 153.

A coil spring 154 connects each clip with the adjacent eye bolt 147, anda wing nut 154 is threaded on each eye bolt 147 on the opposite side ofthe fork from the coil spring 154. Qlach of the coil springs as shownhas hooks at its ends, one book engaging the eye bolt 147 and the otherthe clip 152. The arms 149 of the three armed rock lever extendapproximately vertical while the arm 150 curves laterally and upwardlyand the free end is provided with a brake shoe 155, which is pivoted tothe arm as indicated at 156, and the shoe engages the warp on the warproller.

The operation is as follows The parts are adjusted properly to providethe proper amount of friction with the warp roller filled. As the warpdecreases on the roller the three armed rock lever swings on its pivotalmounting, decreasing the tension on the springs 154 since the brake shoe155 moves upward. The upward movement of the arm 150 permits the arms149 to move toward the levers 1.38 to which they are indirectlyconnected, thus decreasing the tension on the springs 154, anddecreasing at the same time the tension of the brake bands on the brakewheels.

It will be understood that when the warp roller is full a greaterbraking stress is necessary than when the roller is partially empty. ItWill be evident that when the warp roller is filled a larger amount ofwarp is withdrawn at each complete rotation than when several layer-sotwarp have been removed for instance, and With'every layer that isremoved the tension of'the brake bands is decreased.

It will be'evident from the description that by means of the wing nuts154 and the bolts 153. the tension ofthe springs 154 may be v aried. Thebolt 143 andthe nut 144 permit the connection between the slotted armand the lever 138 to be varied, and the lower endof each eye bolt 136which passes between the arms of the fork 137 of the ad- 153. It will beunderstood that ordinarily the clips are adjusted together, and aresimilarly arranged With respect to the journal pin 148.

thereof, of means operated by the'depth'of the Warpon the roller andcontrolling the said mechamsm, said means comprising a rock leverplvoted ad acent to the roller and having one arm provided with a shoeen gaging the warp of the roller, an elbow lever pivoted adjacent toeach end of the warp roller and having an arm connected with the brakemechanism for controlling the same, an adjustable connection between theother arm of each elbow lever and the rock lever for simultaneouslyoperating the sald levers 1n the same direction when the rock lever isrocked, and a spring interl posed in the said connection, each elbowlever havlng means in connection therewith for varying the length of oneof the arms.

*JosEPH DUPUIS.

Copies of this patent may be obtained for five' cents each, byaddressing the f Commissioner of Patents,

' Washington, D. C. I

